Two-Photon Resonant Third Order Harmonic Generation from Atoms and Ions Interacting with Intense Short Laser Pulses

2005 ◽  
Vol 277-279 ◽  
pp. 1049-1053 ◽  
Author(s):  
Young Soon Kim ◽  
Jung Seock Choi ◽  
Baek Il Nam ◽  
Moon Gu Baik ◽  
Takako Kato ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Bound States ◽  
Rabi Oscillation ◽  
Laser Pulses ◽  
Laser Frequency ◽  
Third Order ◽  
Harmonic Intensity ◽  
Atomic Process ◽  
The Third ◽  
Short Laser Pulses

We investigate the third order harmonic generation for model atoms interacting with intense short laser pulses. We focus on the cases where the ponderomotive energy is not big enough to generate high-order harmonics, and where resonant transitions between bound states are also as important as multi-photon ionization and low-order harmonic generation. We find that the third order harmonic intensity from a model hydrogen atom can decrease as the laser frequency draws near a resonance between bound states. We explain this result by looking into the ionization and Rabi oscillation from the numerical calculation of the time-dependent 1-D Schrödinger equation. In order to support our explanation we also investigate the populations of bound states that play an important role in this atomic process.

scholarly journals Ultrafast Third-Order Nonlinear Optical Response Excited by fs Laser Pulses at 1550 nm in GaN Crystals

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3194
Author(s):  
Adrian Petris ◽  
Petronela Gheorghe ◽  
Tudor Braniste ◽  
Ion Tiginyanu
Keyword(s):  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Laser Pulses ◽  
Third Harmonic Generation ◽  
High Repetition Rate ◽  
Third Order ◽  
Third Harmonic ◽  
The Third ◽  
High Repetition ◽  
Gan Crystal

The ultrafast third-order optical nonlinearity of c-plane GaN crystal, excited by ultrashort (fs) high-repetition-rate laser pulses at 1550 nm, wavelength important for optical communications, is investigated for the first time by optical third-harmonic generation in non-phase-matching conditions. As the thermo-optic effect that can arise in the sample by cumulative thermal effects induced by high-repetition-rate laser pulses cannot be responsible for the third-harmonic generation, the ultrafast nonlinear optical effect of solely electronic origin is the only one involved in this process. The third-order nonlinear optical susceptibility of GaN crystal responsible for the third-harmonic generation process, an important indicative parameter for the potential use of this material in ultrafast photonic functionalities, is determined.

Third-Order Harmonic Generation in Atmospheric Air with Focused Intense Femtosecond Laser Pulses

2000 ◽  
Vol 18 (1) ◽  
pp. 57-59 ◽  
Author(s):  
Zhu Chang-Jun ◽  
Qin Yuan-Dong ◽  
Yang Hong ◽  
Wang Shu-Feng ◽  
Gong Qi-Huang
Keyword(s):  
Femtosecond Laser ◽  
Harmonic Generation ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Third Order ◽  
Atmospheric Air

Optical limiting properties of BODIPY dyes substituted with styryl or vinylene groups on the nanosecond timescale

2019 ◽  
Vol 23 (07n08) ◽  
pp. 701-717 ◽  
Author(s):  
Nobuhle Ndebele ◽  
Zweli Hlatshwayo ◽  
Bokolombe P. Ngoy ◽  
Gugu Kubheka ◽  
John Mack ◽  
...  
Keyword(s):  
Thin Films ◽  
Absorption Coefficient ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Nanosecond Laser ◽  
Third Order ◽  
The Third ◽  
Nanosecond Laser Pulses ◽  
532 Nm ◽  
Order Susceptibility

The results of recent studies on the optical limiting properties of BODIPY dyes at 532 and 1064 nm are described and compared. The optical limiting properties of novel 1,7-dimethyl-3,5-di-4-dihydroxyborylstyryl- and 3,5,7-tristyryl-1-methyl-BODIPY dyes were studied in CH2Cl2 and C6H6 and polystyrene thin films using the open aperture Z-scan technique at 532 nm with nanosecond laser pulses to provide an example of how the effective nonlinear absorption coefficient, the third order susceptibility, hyperpolarizability and limiting thresholds can be calculated.

COMPARATIVE STUDIES ON THE THIRD-ORDER NONLINEAR OPTICAL PROPERTIES OF THREE METAL-ORGANIC COMPOUNDS

2011 ◽  
Vol 20 (02) ◽  
pp. 229-236 ◽  
Author(s):  
PENGFEI ZHANG
Keyword(s):  
Near Infrared ◽  
Heavy Atom ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Infrared Region ◽  
Photon Absorption ◽  
Third Order ◽  
The Third ◽  
Planar Transition

The third-order optical nonlinearities of three planar transition metal ( Ni, Cu and Pd ) compounds with rigid quadridentate Schiff base derived from S-benzyl dithiocarbazate, were investigated systematically by Z-scan technique with picosecond laser pulses at 1064 nm. The three compounds exhibit both strong two-photon absorption and effective self-focusing performance. Due to the heavy atom effect, the second hyperpolarizability of PdZ molecule (〈γ〉 = 1.2 × 10-29 esu) was found to be the highest compared to that of the other two molecules. The optical limiting properties were also measured, and the results suggest that PdZ may be a promising candidate for the application to optical limiting in the near-infrared region.

scholarly journals Efficient realization of infrared coherent radiation by the method of parametric light amplification in nonlinear photonic crystals

2021 ◽  
Vol 2131 (5) ◽  
pp. 052092
Author(s):  
O Sabirov ◽  
N Akbarova ◽  
N Atadjanova ◽  
U Sapaev
Keyword(s):  
Photonic Crystals ◽  
Domain Size ◽  
Laser Pulses ◽  
Signal Wave ◽  
Third Order ◽  
Light Amplification ◽  
Nonlinear Photonic Crystals ◽  
Short Laser Pulses ◽  
Optimal Values ◽  
Efficient Realization

Abstract The process of parametric amplification of light from short laser pulses in nonlinear photonic crystals is analyzed numerically. The calculations were carried out taking into account the effects of the dispersion of the medium up to the third order and cubic nonlinearity of the Kerr type. It is shown that a change in the size of domains can significantly affect the formation of a signal wave pulse. On the basis of the results obtained, we analyzed the optimal values of the domain size at which the efficient energetic generation of the signal wave is observed.

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